unprinted_designs = ['iphone case','robot pendant','dodecahedron']
completed_models = []

while unprinted_designs:
    current_design = unprinted_designs.pop()
    
    print("Printing model: " + current_design)
    completed_models.append(current_design)


print("\nThe following models have been printed:")
for completed_model in completed_models:
    print(completed_model)